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parse.y: fix parser_yyerror

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* parse.y (parser_yyerror): fix buffer overflow at truncation of
  error line.  [ruby-core:81790] [Bug #13687]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@59188 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
This commit is contained in:
nobu 2017-06-28 02:02:38 +00:00
parent c28f8b0394
commit ff36c25f47
2 changed files with 15 additions and 7 deletions
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16
parse.y
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@ -5074,14 +5074,16 @@ parser_yyerror(struct parser_params *parser, const char *msg)
buf = ALLOCA_N(char, i+2);
code = p;
caret = p2 = buf;
i = (int)(parser->tokp - p);
while (i-- > 0) {
*p2++ = *p++ == '\t' ? '\t' : ' ';
if (p <= parser->tokp) {
while (p < parser->tokp) {
*p2++ = *p++ == '\t' ? '\t' : ' ';
}
*p2++ = '^';
p++;
}
*p2++ = '^';
if (lex_p > parser->tokp + 1) {
memset(p2, '~', (lex_p - parser->tokp) - 1);
p2 += (lex_p - parser->tokp) - 1;
if (lex_p > p) {
memset(p2, '~', (lex_p - p));
p2 += (lex_p - p);
}
*p2 = '\0';
newline = "\n";

6
test/ruby/test_parse.rb
View file

@ -1001,6 +1001,12 @@ x = __ENCODING__
end;
end
def test_unexpected_token_error
assert_raise(SyntaxError) do
eval('"x"xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx')
end
end
=begin
def test_past_scope_variable
assert_warning(/past scope/) {catch {|tag| eval("BEGIN{throw tag}; tap {a = 1}; a")}}